Hi Ifhandp
I'm not with Laminar Research, just a fellow simmer in the UK.
I have looked at the ProSim website and have found the A320 professional simulator suite user manual, which you can also find @
https://prosim-ar.com/download/ProSimA320_user_manual_1.0.pdf
This manual clearly states that the recommended back end simulator platforms currently being supported are:-
1. Microsoft®Flight Simulator™ version 10 (FSX)
2. Lockheed Martin Prepar3D® version 1.x, 2.x and 3.x
There is no reference to XP11 at all?
I'm a tad confused though why you would wish to choose the ProSim A320 in the first place due to it's cost @ over $1700 US, for the suite and annually renewed update subscription. If the reason is just to support some of your existing cockpit devices, then surely it might be more cost effective to start over with new devices that support XP11 instead?
If you wish to purchase XP11, then great, but why not go for the Flight Factor A320 Ultimate instead, which is a study level aircraft and very highly rated by simulator enthusiasts around the world?
XP11 can be purchased here:
https://www.x-plane.com/ @ $59.99 (includes free updates for the life of the XP11 product!!)
Flight Factor A320 Ultimate can be purchased here:
https://store.x-plane.org/A320-Ultimate_p_688.html @ $89.95
Hope this helps
Regards